<html>
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
		.height{height: 1000px;}
		.goto-top{
			position: fixed;
			bottom: 50px;
			right: 50px;
			width: 140px;
			height: 140px;
			background-color: #dedede;
			border: solid 1px #aaa;
			text-align: center;;
			line-height: 140px;
			border-radius: 140px;
			text-decoration: none;
			color: #333;
		}
	</style>
</head>
<body>
	<a name="top"></a>
	<div class="height"></div>
	<a href="#top" class="goto-top">top</a>
</body>
</html>